LANG.FUNCS.DEFAULT.OVERRIDE : Method Default Value Mismatch

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CodeSonar^® 9.2p0

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C and C++

LANG.FUNCS.DEFAULT.OVERRIDE : Method Default Value Mismatch

Summary

An overriding virtual function specifies a default parameter value, but the parameter has a different default value in a base class.

Properties

Class Name

Method Default Value Mismatch

Significance

style

Mnemonic

LANG.FUNCS.DEFAULT.OVERRIDE

Categories

AUTOSARC++14	AUTOSARC++14:M8-3-1	Parameters in an overriding virtual function shall either use the same default arguments as the function they override, or else shall not specify any default arguments.
MisraC++2008	MisraC++2008:8-3-1	Parameters in an overriding virtual function shall either use the same default arguments as the function they override, or else shall not specify any default arguments.
MisraC++2023	MisraC++2023:13.3.2	Parameters in an overriding virtual function shall not introduce different default arguments
JSF++	JSF++:95	An inherited default parameter shall never be redefined.

Availability

Available for C and C++.

Enabling

Checks for this warning class are disabled by default, and require the unnormalized C ASTs for the project. To enable them, add the following WARNING_FILTER rule and RETAIN_UNNORMALIZED_C_AST specification to the project configuration file.

RETAIN_UNNORMALIZED_C_AST = Yes
WARNING_FILTER += allow class="Method Default Value Mismatch"

Note that retaining the unnormalized ASTs will increase the disk space used to store the project representation, and may make the analysis take longer.

Example

class BaseClass {

  void f(int x=1) {}

  virtual void h1(int x)   {}
  virtual void h2(int x=1) {}
  virtual void h3(int x=1) {}
  virtual void h4(int x=1) {}
};


class DerivedClass : BaseClass {
  void g(int x=0) {}                  // ok: not overriding

  void f(int x=2) {}                  // ok: not virtual

  void h1(int x=1) {}                 // ok: no default specified in base class
  void h2(int x=1) {}                 // ok: same default as in base class
  void h3(int x)   {}                 // ok: does not specify a default
  void h4(int x=2) {}  // 'Method Default Value Mismatch' warning issued here
};

Relevant Configuration File Parameters

The following configuration file parameters affect checks for this warning class.

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